JP2011049193A - Cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting device capable of economically dividing a warped package substrate. <P>SOLUTION: In the cutting device provided with a holding table for holding a packaging substrate, the holding table includes: a plurality of cutting blade escape grooves each formed in a position corresponding to a division-scheduled line of a holding surface holding the packaging substrate; a plurality of suction holes formed in each area defined by the cutting blade escape grooves; and a negative pressure transmission part which transmits negative pressure to suck the packaging substrate to the holding table. The negative pressure transmission part includes: a plurality of central area negative pressure transmission parts which communicates with the center part of each suction area to suck and hold the package substrate when the package substrate is largely divided to reduce the warp; and a plurality of outer circumferential area negative pressure transmission parts, which acts on the center area negative pressure transmission part independently, and communicates with the outer circumferential part of each suction area for sucking and holding the package substrate together with the center area negative pressure transmission part when the package substrate is divided into individual packages. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cutting apparatus having a cutting means including a cutting blade for cutting a workpiece, and more particularly to a cutting apparatus provided with a substrate holding table for holding a substrate such as a CSP (Chip Size Package) substrate. .

  For example, in a manufacturing process of a semiconductor package, a plurality of semiconductor chips on which circuits such as LSI are formed are mounted on a lead frame and bonded, and then sealed with a resin such as glass epoxy to obtain a CSP (Chip Size). A package substrate such as a package substrate is formed. Then, the package substrate is cut along the planned division line by the cutting device, whereby the package is divided into packages having substantially the same size as the semiconductor chip.

  In order to reduce the occurrence of warpage due to resin sealing, the package substrate has a device region (a region where a semiconductor chip exists and is resin-sealed) and a non-device region (a region where no semiconductor chip exists and is not resin-sealed). ) And are alternately adjacent.

  A cutting apparatus that cuts a package substrate includes a holding table that holds the package substrate by suction, and a cutting unit that includes a cutting blade that cuts the package substrate held by the holding table. The package substrate is mounted on the holding table via a fixing jig.

  The fixing jig is used to hold the package substrate by negative pressure. In order to hold the individual packages after being divided, a relief groove of the cutting blade is formed in an area corresponding to the division line of the package substrate to be cut. In addition, a suction port for transmitting a negative pressure is formed in a region corresponding to each package (see, for example, JP-A-2001-24003).

  When cutting package substrates with different package sizes, the package substrates with different package sizes can be cut with a single cutting device by exchanging with a fixing jig corresponding to the package substrate to be cut.

  On the other hand, when the semiconductor chip is sealed with resin, the substrate is likely to warp due to heat. Even if an attempt is made to suck and hold a warped package substrate with the holding table of the cutting device, a negative pressure leaks from a portion where the package substrate and the holding table are not in close contact, so that the package substrate cannot be sucked and held, and the package substrate has a large warp. Has the problem that it cannot be cut.

  In view of this, Japanese Patent Laid-Open No. 2000-124161 proposes a substrate dividing method for dividing a warped package substrate. In this method, the amount of warpage is reduced by dividing the package substrate into small pieces (largely dividing) in advance, and then the package substrate divided by the holding table of the cutting device is sucked and held and divided into individual packages. ing.

JP 2001-24003 A JP 2000-124161 A

  However, for a package substrate with a large amount of warpage, use a device other than a normal cutting device to divide the package substrate, or attach a tape to the package substrate and attach it to an annular frame, and fix the annular frame with a clamp. Therefore, there is a problem that the process is complicated and other devices, tapes, frames and the like are separately required, which is uneconomical.

  This invention is made | formed in view of such a point, The place made into the objective is providing the cutting device which can divide | emit economically the package board | substrate with a curvature.

  According to the first aspect of the present invention, the device is disposed in each of the plurality of regions partitioned by the scheduled division lines and the holding table that holds the packaging substrate sealed with the resin, and the holding table holds the holding substrate. And a cutting means including a cutting means for cutting the packaging substrate, wherein the holding table is formed at a position corresponding to the division line of the holding surface for holding the packaging substrate. A plurality of cutting blade relief grooves, a plurality of suction holes formed in each region defined by the cutting blade relief grooves, and a negative pressure for adsorbing the packaging substrate is transmitted to the holding table. The package substrate includes a plurality of device regions spaced apart from each other and a non-device region between adjacent device regions, The holding table includes a plurality of suction regions corresponding to the device regions, and the negative pressure transmission unit sucks and holds the package substrate when the package substrate is largely divided to reduce warpage. A plurality of central region negative pressure transmitting portions communicating with the central portion of the central region, and the central region negative pressure transmitting portions acting independently with respect to the central region negative pressure transmitting portion and dividing the package substrate into individual packages. There is provided a cutting device comprising a plurality of outer peripheral area negative pressure transmitting parts communicating with the outer peripheral part of each suction area for sucking and holding the package substrate together with the transmitting part.

  According to the second aspect of the present invention, the device is disposed in each of the plurality of regions divided by the scheduled division lines, and the holding table that holds the packaging substrate sealed with the resin, and the holding table holds the device. And a cutting means including a cutting means for cutting the packaging substrate, wherein the holding table is formed at a position corresponding to the division line of the holding surface for holding the packaging substrate. A plurality of cutting blade relief grooves, a plurality of suction holes formed in each region defined by the cutting blade relief grooves, and a negative pressure for adsorbing the packaging substrate is transmitted to the holding table. The package substrate includes a plurality of device regions spaced apart from each other and a non-device region between adjacent device regions, The holding table includes a plurality of suction regions corresponding to the device region and a non-suction region between adjacent suction regions, and the negative pressure transmission unit divides the package substrate into large parts to reduce warpage. A central region negative pressure transmission portion communicating with a central portion of the region across the plurality of suction regions and the non-suction region for sucking and holding the package substrate, and acting independently on the central region negative pressure transmission portion, An outer peripheral region negative pressure transmitting portion communicating with the outer peripheral portion in the region surrounding the central portion that sucks and holds the package substrate together with the central region negative pressure transmitting portion when the package substrate is divided into individual packages; A cutting device characterized by comprising:

  According to the cutting apparatus of the present invention, the negative pressure leak is prevented by sucking and holding the package substrate placed on the holding table through a partial suction hole communicating with the central region negative pressure transmission unit. Even the warped package substrate can be stably sucked and held by the holding table.

  In this state, the package substrate is largely divided to reduce the warpage of the substrate, and in addition to the central region negative pressure transmission unit, the outer peripheral region negative pressure transmission unit acts simultaneously to operate all the suction holes of the holding table. The package substrate can be divided into individual packages while holding the package substrate on the holding table.

It is a top view of a package substrate. It is a side view which expands and shows a part of package substrate. It is a perspective view which shows a mode that a package board | substrate is mounted in a fixing jig. It is a partially broken perspective view of a cutting device. It is a top view of a fixing jig. 6A is a plan view of the fixing jig in which each suction area of the fixing jig according to the first embodiment is divided into a central suction area and an outer periphery suction area, and FIG. 6B is a plan view of the fixing jig. It is a longitudinal cross-sectional view of the holding table of 1st Embodiment comprised by mounting on a tool base. It is a perspective view of the jig base of a 1st embodiment. 8A is a plan view of the fixing jig showing the suction area of the fixing jig according to the second embodiment divided into a central suction area and an outer peripheral suction area, and FIG. 8B is a plan view of the fixing jig. It is a longitudinal cross-sectional view of the holding table of 2nd Embodiment comprised mounted on a base. It is a top view of the package board | substrate after large division.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Referring to FIG. 1, there is shown a plan view of an example of a package substrate suitable for division with the cutting apparatus of the present invention. The package substrate 2 has, for example, a rectangular metal frame 4. In the example shown in the figure, there are three device regions 6 a and 6 b in the region surrounded by the outer peripheral surplus region 5 and the non-device region 5 a of the metal frame 4. , 6c.

  In each of the device regions 6a, 6b, 6c, a plurality of device forming portions 10 defined by first and second scheduled division lines 8a, 8b provided vertically and horizontally so as to be orthogonal to each other are defined. A plurality of electrodes 12 are formed on the forming portion 10.

  The electrodes 12 are insulated from each other by a resin molded on the metal frame 4. By cutting the first division planned line 8a and the second division planned line 8b, the electrodes 12 of each device appear on both sides thereof.

  As shown in FIG. 2, devices 14 are formed on the back surfaces of the device forming portions 10 in the device regions 6 a, 6 b, 6 c, and the electrodes included in the devices 14 and the electrodes 12 are connected. The devices 14 in the device regions 6a, 6b, and 6c are sealed with resin, and a resin sealing portion 16 is formed on the back surface of the device regions 6a, 6b, and 6c.

  The package substrate 2 configured as described above is fixed to a fixing jig 20 as shown in FIG. 3, and is divided into individual packages (devices) by cutting the dividing lines 8a and 8b.

  The fixing jig 20 has a plurality of relief grooves 22 for avoiding contact between the fixing jig 20 and the cutting blade when a cutting blade of a cutting apparatus, which will be described later, is cut into the division lines 8 a and 8 b of the package substrate 2. Are formed, and suction holes 24 for sucking individual devices mounted on the package substrate 2 are formed for each device 14.

  The fixing jig 20 has three suction regions 25a, 25b, and 25c corresponding to the three device regions 6a, 6b, and 6c of the package substrate 2. Each of the suction regions 25a to 25c has a plurality of suction holes 24 for sucking individual packages (CSP) of the package substrate 2.

  Adjacent to each corner of the fixing jig 20, two protrusions are formed, and a total of eight protrusions 26 are formed. The package substrate 2 is positioned and mounted on the fixing jig 20 by bringing the vicinity of the four corners of the package substrate 2 into contact with the two protrusions 26.

  By mounting the fixing jig 20 on the jig base 32 of the cutting apparatus shown in FIG. 4, a holding table (see FIG. 6B) 34 for holding the package substrate 2 is configured. The holding table 34 can move in the X-axis direction and can rotate.

  When the package substrate 2 is placed on the holding table 34 and a suction force is applied to the jig base 32, the suction force is applied to the suction holes 24 of the fixing jig 20 shown in FIG. It is sucked and held by the fixing jig 20.

  The cutting device 30 shown in FIG. 4 is provided with a cutting means (cutting unit) 42 configured by attaching a cutting blade 40 to the tip of a spindle 38. Further, alignment means 44 for detecting a division line to be cut of the package substrate 2 so as to be movable in the Y-axis direction and the Z-axis direction integrally with the cutting means 42 is provided.

  The package substrate 2 held on the holding table 34 via the fixing jig 20 is positioned immediately below the alignment means 44 by moving in the + X-axis direction, and is captured by an imaging unit 46 such as a CCD camera constituting the alignment means 44. The surface is imaged and a division line 8a or 8b to be cut is detected. After the alignment is completed, the cutting blade 38 is moved in the Y-axis direction, and the planned dividing line 8a or 8b and the cutting blade 38 are aligned in the Y-axis direction.

  Referring to FIG. 5, a plan view of a fixing jig 20 similar to the fixing jig shown in FIG. 3 is shown. In FIG. 5, the protruding portion 26 shown in FIG. 3 is omitted. The fixing jig 20 has three suction regions 25a, 25b, and 25c corresponding to the device regions 6a, 6b, and 6c of the package substrate 2. Each suction region 25 a to 25 c has a plurality of suction holes 24 corresponding to each CSP of the package substrate 2.

  Referring to FIG. 6A, there is shown a plan view of the fixing jig 20 in which each suction area according to the suction mode of the first embodiment is divided into a central suction area and an outer peripheral suction area. According to the suction mode of the first embodiment, each of the suction regions 25a to 25c is divided into a central suction region 50 and an outer peripheral suction region 52 surrounding the central suction region 50. The central suction region 50 and the outer peripheral suction region 52 are separated. Can be sucked independently.

  Referring to FIG. 6B, a longitudinal sectional view of the holding table 34 of the first embodiment configured by mounting the fixing jig 20 shown in FIG. 6A on the jig base 32 is shown. . The jig base 32 includes three central area negative pressure transmission portions 54 communicating with the respective central suction areas 50 of the fixing jig 20 and three outer peripheral area negative pressure transmission portions 60 communicating with the respective outer peripheral suction areas 52. Have.

  Each central region negative pressure transmission unit 54 is connected to a suction source 58 via a switching valve 56, and each outer peripheral region negative pressure transmission unit 60 is connected to a suction source 58 via a switching valve 62. Reference numeral 64 denotes a jig negative pressure transmission unit for sucking and holding the fixing jig 20 by the jig base 32, and is connected to the suction source 58 via the switching valve 66. FIG. 7 shows a perspective view of the jig base 32 according to the first embodiment.

  Hereinafter, a method for dividing the package substrate 20 using the holding table 34 of the first embodiment configured as described above will be described. In general, since the package substrate 20 has a warp, if all the suction holes 24 are opened and the package substrate 20 is held by suction, a negative pressure leak occurs in the suction holes 24 where the package substrate 20 is lifted. The package substrate 20 cannot be stably sucked and held. Therefore, in the present embodiment, the suction areas 25a to 25c are divided into the central suction area 50 and the outer peripheral suction area 52, and can be sucked independently.

  First, when the package substrate 20 is largely divided to reduce its warpage, the switching valve 66 is switched to suck and hold the fixing jig 20 by the jig base 32, and the switching valve 56 is switched to switch each suction region 25a, The central suction area 50 of 25b and 25c is connected to the suction source 58, and the package substrate 2 is sucked and held only by the central suction area 50. At this time, the outer peripheral suction region 52 is not performing a suction operation.

  Since each central suction region 50 has a relatively small area, even if the package substrate 20 is warped, the package substrate 20 can be stably sucked and held in the central suction region 50 without causing negative pressure leakage. it can.

  In a state where the package substrate 20 is sucked and held in the central suction region 50 as described above, the package substrate 20 is cut by the cutting blade 40, and the package substrate 2 is divided into four (largely divided) as shown in FIG. Reference numeral 76 denotes a dividing groove. When the package substrate 2 is divided into large parts in this way, the amount of warpage of the large-divided package substrate 2 is reduced.

  After the package substrate 2 is thus largely divided, the switching valve 62 is switched to connect each outer peripheral suction region 52 to the suction source 58, and the package substrate 2 is sucked and held in the outer peripheral suction region 52 in addition to the central suction region 50. .

  Since the package substrate 2 is largely divided and its warpage is reduced, even if the package substrate 2 is sucked and held in the outer periphery suction region 52, the package substrate 2 can be sucked and held stably without causing negative pressure leakage. Can do.

  Therefore, in a state where the package substrate 2 is sucked and held in the central suction region 50 and the outer periphery suction region 52, the respective dividing lines 8a and 8b are cut by the cutting blade 40 to divide the package substrate 2 into individual packages (CSP). To do.

  Referring to FIG. 8A, there is shown a plan view of a fixing jig 20A in which the suction area is divided into a central suction area and an outer peripheral suction area by the suction mode according to the second embodiment of the present invention. In the present embodiment, a large region over the non-suction region between the suction region adjacent to the three suction regions 25a, 25b, and 25c and the suction region is defined as 51, and this region 51 is defined as the central suction region 50A and the outer peripheral suction region 52A. Divide into

  Referring to FIG. 8B, there is shown a longitudinal sectional view of a holding table 34A of the second embodiment configured by mounting the fixing jig 20A on the jig base 32A. The central suction region 50A of the fixing jig 20A is connected to the suction source 58 via the central region negative pressure transmission portion 54A and the switching valve 56, and the outer peripheral suction region 52A of the fixing jig 20A is the outer peripheral region negative pressure transmission portion 60A. And connected to the suction source 58 via the switching valve 62. On the other hand, the fixing jig 20 </ b> A mounted on the jig base 32 </ b> A is connected to the suction source 58 via the jig negative pressure transmission unit 64 </ b> A and the switching valve 66.

  Hereinafter, the operation of the holding table 34A of the second embodiment configured as described above will be described. When the fixing jig 20A is mounted on the jig base 32A, the switching valve 66 is switched and the jig negative pressure transmitting portion 64A is connected to the suction source 58, the fixing jig 20A is sucked and held by the jig base 32A. The

  In this state, when the switching valve 56 is switched to connect the central region negative pressure transmitting portion 54A to the suction source 58, the central suction region 50A of the fixing jig 20A is communicated with the suction source 58 and mounted on the fixing jig 20A. The package substrate 2 is sucked and held in the central suction region 50A of the fixing jig 20A.

  Since the package substrate 2 is sucked and held in the central suction region 50A having a relatively small area of the fixing jig 20A in this way, the package substrate 2 can be stabilized without causing negative pressure leakage even if the package substrate 2 is warped. The package substrate 2 can be divided into large parts (four parts) as shown in FIG.

  After the package substrate 2 is largely divided, the switching valve 62 is switched to connect the outer peripheral area negative pressure transmitting portion 60A to the suction source 58, and the outer peripheral suction area 52A is communicated with the suction source 58 in addition to the central suction area 50A.

  As a result, the package substrate 2 is sucked and held in the entire three suction regions 25a, 25b, and 25c of the fixing jig 20A. However, the package substrate 2 is divided into large parts and the amount of warpage thereof is reduced. 2 can be stably sucked and held.

  Therefore, while the package substrate 2 is stably sucked and held by the three suction regions 25a to 25c of the fixing jig 20A, each of the division lines 8a and 8b is cut by the cutting blade 40, and the package substrate 2 is separated into individual packages ( CSP).

2 Package substrate 6a, 6b, 6c Device area 8a, 8b Scheduled division line 20 Fixing jig 22 Escape groove 24 Suction hole 25a-25c Suction area 30 Cutting device 32 Jig base 34, 34A Holding table 40 Cutting blade 50, 50A Center Suction area 52, 52A Outer periphery suction area 54 Central area negative pressure transmission part 60 Outer periphery area negative pressure transmission part

Claims (2)

A holding table that holds a packaging substrate sealed with a resin and in which a device is disposed in each of a plurality of regions partitioned by the division lines, and cutting that cuts the packaging substrate held on the holding table A cutting device comprising a cutting means including a blade,
The holding table has a plurality of cutting blade relief grooves formed at positions corresponding to the division lines on the holding surface for holding the packaging substrate;
A plurality of suction holes formed in each region defined by the cutting blade relief groove;
A negative pressure transmission unit that transmits a negative pressure for adsorbing the packaging substrate to the holding table;
The package substrate includes a plurality of device regions spaced from each other and a non-device region between adjacent device regions, and the holding table includes a plurality of suction regions corresponding to each device region,
The negative pressure transmission portion includes a plurality of central region negative pressure transmission portions that communicate with the central portion of each suction region that sucks and holds the package substrate when the package substrate is largely divided to reduce warpage;
The outer periphery of each suction region that acts independently on the central region negative pressure transmission unit and sucks and holds the package substrate together with the central region negative pressure transmission unit when the package substrate is divided into individual packages. A cutting device comprising: a plurality of outer peripheral region negative pressure transmission parts communicating with the part. A holding table that holds a packaging substrate sealed with a resin and in which a device is disposed in each of a plurality of regions partitioned by the division lines, and cutting that cuts the packaging substrate held on the holding table A cutting device comprising a cutting means including a blade,
The holding table has a plurality of cutting blade relief grooves formed at positions corresponding to the division lines on the holding surface for holding the packaging substrate;
A plurality of suction holes formed in each region defined by the cutting blade relief groove;
A negative pressure transmission unit that transmits a negative pressure for adsorbing the packaging substrate to the holding table;
The package substrate includes a plurality of device regions spaced apart from each other and a non-device region between adjacent device regions, and the holding table includes a plurality of suction regions corresponding to the device region and a non-device region between adjacent suction regions. A suction area,
The negative pressure transmission unit is configured to communicate a central region negative pressure that communicates with a central portion of the plurality of suction regions and non-suction regions that suck and hold the package substrate when the package substrate is largely divided to reduce warpage. A transmission part;
Acts independently with respect to the central region negative pressure transmitting portion, and surrounds the central portion that sucks and holds the package substrate together with the central region negative pressure transmitting portion when the package substrate is divided into individual packages. A cutting apparatus comprising: an outer peripheral region negative pressure transmission portion communicating with an outer peripheral portion in the region.

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